Can Mexico Reclaim the Rivers of 25 Million People?
A 20-Billion-Peso Bet

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At her morning press conference on July 16, Mexican President Claudia Sheinbaum announced a cleanup plan for the three rivers officially considered the country's most polluted: the Atoyac, the Lerma-Santiago and the Tula. The government will spend 20 billion pesos over the current term (2024–2030) — roughly US$1.1 billion at mid-July's exchange rate of about 17.5 pesos to the dollar — reaching 25 million people across 10 states and 61 municipalities.

What was announced: 93 projects and 3,202 discharge points

According to the government, the plan bundles 93 separate works across the three basins: building and upgrading treatment plants, laying collector sewers, restoring riverbeds, reforesting slopes and reducing flood risk. Of the 20 billion pesos, some 2.5 billion has already been spent or committed across 2025 and 2026.

The scale was broken down river by river. The Lerma-Santiago runs 1,360 kilometers across six states — México, Querétaro, Guanajuato, Michoacán, Jalisco and Nayarit — with 21.4 million people in its basin. The Tula covers 191 kilometers and 0.8 million people in México state and Hidalgo; the Atoyac, 162 kilometers and 3.7 million people in Tlaxcala and Puebla. First-phase progress was reported at 90 percent for the Lerma-Santiago (65 km), 85 percent for the Atoyac (63 km) and 62 percent for the Tula (74 km).

Execution falls to Environment Secretary Alicia Bárcena and to Efraín Morales, director general of the National Water Commission (Conagua) — the federal body that administers water rights and enforces discharge standards, and that has run the field surveys and community consultations behind the plan.

Context: half a century of promises

Announcements like this need to be read against a long backdrop. Cleaning up the Lerma-Chapala-Santiago basin has been a stated priority of practically every Mexican administration since the 1980s. The pollution nonetheless persists, and unusually high rates of chronic kidney disease in the basin have been flagged repeatedly.

On the Atoyac, Mexico's National Human Rights Commission issued Recommendation 10/2017, finding that residents of several municipalities in Tlaxcala and Puebla had their right to a healthy environment violated, and faulting all three levels of government for inaction. Community groups have since complained that the recommendation went largely unimplemented. The 20 billion pesos, then, is less a fresh start than an answer to homework left undone.

The real story is the number 3,202

The most consequential part of the announcement may not be the budget. The government says it surveyed 340 kilometers of river, sampled 322 sites, and identified 3,202 polluting discharges, 479 illegal dumps and 460 priority industries with high pollution potential, along with deforestation across 22 percent of the surveyed area.

Cleanup budgets get cut when governments change. But data on where the contamination originates, once published, cannot be un-published. It gives residents, researchers and local reporters a foothold to pursue specific operators. A treatment plant is a device for absorbing filth downstream; a register of discharge points is a device for making upstream behavior visible. If past administrations failed less for lack of the former than for lack of the latter, this disclosure matters more than the peso figure.

My perspective

What caught my attention was how progress is being reported. "Ninety percent of the first phase" describes construction, not water quality. Environmental announcements often substitute inputs — money committed, kilometers built — for outcomes such as measured water quality or reduced illness. Keeping the two apart is where careful reading starts.

Then there is the question of scale. Twenty billion pesos, spread over six years and 25 million people, works out to roughly 130 pesos per person per year. That is not lavish for building urban wastewater infrastructure from a low base. Estimates circulating for years have put the cost of cleaning the Lerma alone at around 14 billion pesos. Read that way, this is not a budget to finish the job on three rivers, but a budget to start with the filthiest stretches.

Three things to watch. First, whether the register of 3,202 discharge points is actually published as a map or database and kept updated. Second, whether Conagua reports water-quality monitoring — biochemical oxygen demand, heavy metals — separately from construction progress. Third, whether the 20 billion pesos appears as real line items in federal budgets from 2027 onward. If the third fails, this plan joins the queue of promises that came before it.

Glossary

saneamiento = sanitation or cleanup; the administrative term for making a river healthy again. Conagua (Comisión Nacional del Agua) = the National Water Commission, the federal agency for water rights and discharge regulation. descarga = a discharge; here, an outfall emptying into a river. cuenca = river basin. tiradero clandestino = an illegal dumpsite.

A treatment plant absorbs filth downstream; a register of discharge points makes upstream behavior visible.

※ This article is the author’s commentary based on public information. Please confirm the latest figures, dates and procedures with governments and primary sources. Quotations are kept minimal and sources are cited.